Push rod Anti-jamming structure and switching electrical appliance

Abstract

Provided in the present disclosure is a push rod anti-jamming structure, comprising an isolation ring and a sealing sleeve, wherein the sealing sleeve is made of a flexible or elastic material, and is fixedly connected to a push rod, the sealing sleeve has an outer peripheral surface, a protruding structure protruding radially outwards is formed on the outer peripheral surface, and the protruding structure is arranged circumferentially around the entire outer peripheral surface; and the isolation ring has a cylindrical main body, and the protruding structure is in an interference fit with the inner wall of the cylindrical main body.

Description

Push rod anti-stuck structure and switch electrical appliances

[0001] This disclosure claims priority to Chinese patent application No. 202420559102.6 filed on March 21, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the technical field of switch electrical appliances, and in particular to a push rod anti-stuck structure and a switch electrical appliance having the push rod anti-stuck structure. Background Art

[0003] A contactor is a highly versatile switching device that can frequently connect and disconnect main circuits and enable remote control. It is widely used in circuit control technology. A contactor generally consists of a control system, a contact system, a motion mechanism, and a sealing system. The motion mechanism typically includes an electromagnet. When power is supplied to the electromagnet's coil, the coil generates a magnetic field, which attracts the movable core, causing it to move upward. This forces the reaction spring to compress, generating a reaction force. When the movable contact bridge contacts the stationary contact, the contact spring also compresses, generating a reaction force. When the movable core contacts the stationary core, movement ceases, the movable contact bridge and the stationary contact establish reliable contact, and conduction is established between the two stationary contacts, energizing the controlled external circuit. When power is removed from the coil, the attraction ceases, and the contact spring and reaction spring simultaneously act to move the movable core downward. When the movable contact bridge separates from the stationary contact, the reaction force of the contact spring disappears, but the reaction spring continues to provide a reaction force, causing the movable core to move downward until the push rod seat contacts the stationary core, at which point the movable core returns to its original position and the controlled external circuit is completely disconnected.

[0004] In existing contactors, the arc-extinguishing chamber housing the contact system communicates with the actuating chamber housing the electromagnet and other magnetic circuit mechanisms. A partition between the arc-extinguishing and actuating chambers is fitted with a clearance between the partition and the push rod. During frequent connection and disconnection of the contact system, foreign matter generated by arcing between the moving and static contacts in the arc-extinguishing chamber can easily fall into the magnetic circuit mechanism through the gap between the partition and the push rod, causing the moving iron core to become stuck and fail, affecting normal contactor actuation and leading to unexpected risks. Summary of the Invention

[0005] To this end, in response to at least one of the above problems, the present disclosure provides a push rod anti-stuck structure and a switch electrical appliance having the push rod anti-stuck structure.

[0006] This disclosure is implemented using the following scheme:

[0007] The present disclosure proposes a push rod anti-stuck structure, wherein the push rod is used to actuate the contact system of a switching electrical appliance; a first space and a second space are provided in the switching electrical appliance, and the switching electrical appliance is further provided with a partition plate as a partition structure for separating the first space and the second space in the switching electrical appliance, and the push rod is movably inserted through the partition plate, and the push rod anti-stuck structure includes an isolation ring and a sealing sleeve, and the sealing sleeve is made of a flexible material with resilience, and the sealing sleeve is fixedly connected to the push rod, and the sealing sleeve has an outer peripheral surface, and at least one convex portion is formed on the outer peripheral surface, and the at least one convex portion is distributed over the entire outer periphery of the outer peripheral surface of the sealing sleeve; the isolation ring is arranged on the partition plate, and the isolation ring has a cylindrical main body, and the convex portion is interference fit with the inner wall of the cylindrical main body by its resilience.

[0008] In one embodiment, the protrusions are arranged around the entire outer peripheral surface and are thus distributed over the entire outer circumference of the outer peripheral surface.

[0009] In one embodiment, the sealing sleeve is provided with two or more convex portions on the outer circumferential surface, a concave portion is formed between two adjacent convex portions, and the concave portion is provided around the entire outer circumferential surface so that the outer circumferential surface of the sealing sleeve forms a bellows-like structure.

[0010] In one embodiment, the sealing sleeve is provided with two or more protrusions on the outer peripheral surface, and the protrusions include a first protrusion and a second protrusion, the second protrusion has a thickness thicker than the first protrusion, and the second protrusion and the first protrusion are arranged along the axial direction of the sealing sleeve.

[0011] In one embodiment, the second protrusion is closer to the partition than at least one of the first protrusions.

[0012] In one embodiment, the sealing sleeve is fixedly connected to a mounting seat, and the mounting seat is fixedly connected to the push rod, so that the push rod is fixedly connected to the sealing sleeve; the sealing sleeve is arranged below the mounting seat.

[0013] In one embodiment, the mounting seat is a spring seat, one side of the mounting seat is used for mounting and cooperating with one end of the contact spring, and the other side of the mounting seat is used for mounting the sealing sleeve.

[0014] In one embodiment, a stepped hole is provided on the mounting seat, and a locking structure matching the stepped hole is formed on the sealing sleeve, and the locking structure has a structure that is larger at the top and smaller at the bottom. The sealing sleeve is reliably fixed to the mounting seat by means of the locking structure of the sealing sleeve and the stepped hole of the mounting seat.

[0015] In one embodiment, the mounting seat has a more outwardly flared outer edge, which completely covers the range of the cylindrical body of the isolation ring in the radial direction of the push rod and continues to extend outward.

[0016] In one embodiment, the outer edge extends downward to form a lower flange, and the lower flange at least partially covers the outer side of the cylindrical body of the isolation ring.

[0017] In one embodiment, an avoidance groove is provided on the upper end surface of the partition, and the lower end of the sealing sleeve can be accommodated in the avoidance groove.

[0018] The present disclosure further provides a switch electrical appliance, characterized by comprising the push rod anti-stuck structure as described above.

[0019] In one embodiment, the switching electrical appliance is a contactor, which includes a hollow shell, a magnetic circuit system and a contact system; a partition is provided in the shell to form a first space and a second space in the shell, the first space is an arc extinguishing chamber for installing the contact system; the second space is an actuating chamber for installing the magnetic circuit system, the push rod is movably passed through the partition, the contact system includes two fixed contacts and a moving contact provided on the shell, the push rod is transmission-connected to the moving contact, and the push rod anti-stuck structure is provided between the push rod and the partition.

[0020] The present disclosure proposes a push rod anti-stuck structure, including an isolation ring and a sealing sleeve, wherein the sealing sleeve is made of a flexible material with resilience, the sealing sleeve is fixedly connected to the push rod, the sealing sleeve has an outer peripheral surface, a protruding structure protruding radially outward is formed on the outer peripheral surface, and the protruding structure is distributed circumferentially on the entire outer peripheral surface of the sealing sleeve; the isolation ring has a cylindrical main body, and the protruding structure is interference fit with the inner wall of the cylindrical main body by virtue of its elastic force.

[0021] In one embodiment, the protruding structure includes at least one protrusion, and each of the protrusions is arranged around the entire outer circumference.

[0022] In one embodiment, the protruding structure includes two or more protrusions arranged along the axial direction of the sealing sleeve, and a recess is formed between two adjacent protrusions, so that the protruding structure forms a bellows-like structure, wherein the axial direction of the sealing sleeve is consistent with the length direction of the push rod.

[0023] In one embodiment, the protruding structure includes at least one first protrusion and at least one second protrusion, the thickness of the second protrusion along the axial direction of the sealing sleeve is greater than the thickness of the first protrusion along the axial direction of the sealing sleeve, and the at least one second protrusion and the at least one first protrusion are arranged along the axial direction of the sealing sleeve, wherein the axial direction of the sealing sleeve is consistent with the length direction of the push rod.

[0024] In one embodiment, the sealing sleeve is fixedly connected to a mounting seat, and the mounting seat is fixedly connected to the push rod, so that the push rod is fixedly connected to the sealing sleeve; the sealing sleeve is arranged below the mounting seat.

[0025] In one embodiment, a stepped hole is provided on the mounting seat, and a locking structure matching the stepped hole is formed on the sealing sleeve. The locking structure is a structure with a larger top and a smaller bottom. The sealing sleeve is fixedly connected to the mounting seat by means of the locking structure of the sealing sleeve and the stepped hole of the mounting seat.

[0026] In one embodiment, the mounting seat has an outer edge extending radially outward along the mounting seat, and the outer edge completely covers the range of the cylindrical body of the isolation ring in the radial direction of the push rod, wherein the radial direction of the mounting seat is perpendicular to the length direction of the push rod.

[0027] In one embodiment, the outer edge extends in an axial direction perpendicular to the radial direction of the mounting seat to form a lower flange, and the lower flange at least partially covers the outer side of the cylindrical body of the isolation ring.

[0028] The present disclosure proposes a push rod anti-stuck structure, including the push rod anti-stuck structure described in the present disclosure.

[0029] In one embodiment, the switching electrical appliance is a contactor, which includes a hollow shell, a magnetic circuit system and a contact system; a partition is provided in the shell, and the partition divides the space in the shell into a first space and a second space, the first space is an arc extinguishing chamber, which is used to install the contact system; the second space is an actuating chamber, which is used to install the magnetic circuit system, the push rod is movably passed through the partition, and the contact system includes two fixed contacts and a moving contact provided on the shell, the push rod is transmission-connected to the moving contact, and the push rod anti-stuck structure is provided between the push rod and the partition.

[0030] In one embodiment, the isolation ring in the push rod anti-stuck structure is arranged on the partition, and the protruding structure includes at least one first protrusion and at least one second protrusion, wherein the second protrusion is closer to the partition than at least one first protrusion.

[0031] In one embodiment, the sealing sleeve in the push rod anti-stuck structure is fixedly connected to a mounting seat, the mounting seat is fixedly connected to the push rod, the mounting seat is a spring seat, one side of the mounting seat is used to be installed and cooperated with one end of the contact spring in the contact system, and the other side of the mounting seat is used to install the sealing sleeve in the push rod anti-stuck structure.

[0032] In one embodiment, an avoidance groove is provided on the upper end surface of the partition, and the lower end of the sealing sleeve in the push rod anti-stuck structure can be accommodated in the avoidance groove.

[0033] The technical solution provided by this disclosure has the following technical effects:

[0034] 1. The present disclosure provides a push rod anti-jamming structure, including an isolation ring and a sealing sleeve, wherein the sealing sleeve is made of a flexible material with resilience, the sealing sleeve is fixedly connected to the push rod, the sealing sleeve has an outer peripheral surface, and a protruding structure protruding radially outward is formed on the outer peripheral surface, and the protruding structure is distributed on the entire outer circumference of the outer peripheral surface of the sealing sleeve; the isolation ring has a cylindrical main body, and the protruding structure is interference fit with the inner wall of the cylindrical main body to form a sealing structure to prevent the normal movement of the push rod from being affected by the jamming of foreign objects.

[0035] 2. Because the sealing sleeve is made of a flexible material with resilience, the sealing sleeve can deform at the point of contact with the isolation ring, greatly reducing the lateral force between the sealing sleeve and the isolation ring. When the push rod begins to move, the protruding structure of the sealing sleeve deforms due to its own elasticity or flexibility, and the push rod can use this deformation to start moving without having to overcome the interference friction between the sealing sleeve and the inner wall of the cylindrical body. Therefore, the push rod can start smoothly without increasing the thrust of its initial movement. In addition, when the push rod moves, the sealing sleeve and the isolation ring can always maintain contact, enhancing the sealing and guiding functions, while also having a certain effect of absorbing vibration and reducing noise. The adjacent convex and concave portions on the outer circumference of the sealing sleeve increase the flexibility of the sealing sleeve at the point of contact with the isolation ring, thereby further enhancing the above-mentioned effect and enhancing the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 is a cross-sectional view of an embodiment of a contactor in a switching apparatus disclosed herein;

[0037] FIG2 is a top view of FIG1 ;

[0038] FIG3 is an enlarged view of point A in FIG1 when the contactor is in an initial state;

[0039] FIG4 is an enlarged view of point A in FIG1 when the contactor is in a semi-energized state;

[0040] FIG5 is an enlarged view of point A in FIG1 when the contactor is in an energized state;

[0041] FIG6 is an enlarged view of point A in FIG1 when the contactor is in a non-energized state;

[0042] FIG7 is a perspective view of a sealing sleeve in an embodiment of a contactor in a switching apparatus of the present disclosure;

[0043] FIG8 is a front view of FIG7;

[0044] FIG9 is a perspective view of a contactor embodiment of a switching device in the present disclosure, in which a mounting base is integrally formed on a push rod;

[0045] Figure 10 is a front view of Figure 9;

[0046] FIG11 is a front view of a sealing sleeve secondary molded on a mounting seat and a push rod in an embodiment of a contactor in a switching electrical apparatus of the present disclosure;

[0047] FIG12 is a perspective view of a contactor in an embodiment of a switching device of the present disclosure with the housing removed;

[0048] FIG13 is an enlarged view of A in FIG1 under another embodiment;

[0049] FIG14 is an enlarged view of point A in FIG1 according to another embodiment. DETAILED DESCRIPTION

[0050] To further illustrate various embodiments, the present disclosure is accompanied by accompanying drawings. These drawings form part of the disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of the present disclosure. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0051] The present disclosure will now be further described with reference to the accompanying drawings and specific embodiments.

[0052] As shown in Figures 1-12, this embodiment provides a contactor 1 comprising a hollow housing 2. A partition 10 is disposed within the housing 2, thereby dividing the space within the housing 2 into a first space 21 and a second space 22. In this embodiment, the first space 21 is an arc-extinguishing chamber for housing the contact system 3; the second space 22 is an actuating chamber for housing the magnetic circuit system 4. A push rod 6 is movably disposed through the partition 10.

[0053] The magnetic circuit system 4 is used to actuate the push rod 6 to generate movement. The contact system 3 includes two fixed contacts 11 and 12 (hereinafter referred to as the first fixed contact 11 and the second fixed contact 12) provided on the housing 2, and a moving contact 7. The push rod 6 is transmission-connected to the moving contact 7. A contact spring 9 is provided between the push rod 6 and the moving contact 7. A mounting seat 14 is fixed on the push rod 6. The mounting seat 14 is a spring seat. The push rod 6 abuts against one end of the contact spring 9 through the mounting seat 14. The other end of the contact spring 9 is connected to the moving contact 7. The magnetic circuit system 4 is excited to generate magnetic force, actuating the push rod 6 to generate movement. The push rod 6 drives the moving contact 7 to move and contact the first fixed contact 11 and the second fixed contact 12, so that the first fixed contact 11 and the second fixed contact 12 are connected, and the controlled external circuit is connected. At this time, the contact spring 9 is also compressed. The push rod 6 is connected to a reset spring 8. When the magnetic circuit system 4 is in a non-excited state, no magnetic force is generated in the magnetic circuit system 4. The push rod 6 moves in the direction of returning to its original position due to the action of the reset spring 8 and the contact spring 9. After the contact spring 9 is completely released and restored, the moving contact 7 is disconnected from the first fixed contact 11 and the second fixed contact 12. The push rod 6 is reset to its initial position due to the action of the reset spring 8. The first fixed contact 11 and the second fixed contact 12 are disconnected, and the controlled external circuit is disconnected. The contactor 1 is also provided with a control connector 13 for inputting or disconnecting an excitation signal to the magnetic circuit system 4.

[0054] Since the existing contact system is frequently connected and disconnected, foreign matter generated by arcing in the first space 21, i.e., the arc extinguishing chamber, between the moving contact and the fixed contact can easily fall into the magnetic circuit system 4 through the gap between the partition 10 and the push rod 6, causing the push rod 6 to become stuck and fail, which will affect the normal actuation of the contactor 1.

[0055] Based on this, in this embodiment, a push rod anti-stuck structure is provided between the push rod 6 and the partition 10. Specifically, the push rod anti-stuck structure is installed on the partition 10, and the push rod anti-stuck structure includes a sealing sleeve 15 and an isolation ring 16, and the sealing sleeve 15 is fixedly connected to the push rod 6. For example, the sealing sleeve 15 can be fixedly connected to the push rod 6 through a mounting seat 14. In this embodiment, the mounting seat 14 is a spring seat, one side of the mounting seat 14 is mounted and cooperated with the contact spring 9, and the other side of the mounting seat 14 is installed with the sealing sleeve 15. With such a configuration, the structure of the contactor 1 can be made more compact, and since the sealing sleeve 15 is attached to the mounting seat 14 along the direction of movement of the push rod, the sealing sleeve 15 can be made smaller in size and lighter in weight, which is more conducive to reducing the power consumption of the coil.

[0056] The sealing sleeve 15 is fixedly connected to the mounting seat 14, so that the sealing sleeve 15 is fixedly connected to the push rod 6. The isolation ring 16 has a cylindrical body 161 and a connecting portion 162. The cylindrical body 161 is a hollow cylindrical structure with openings at both ends. It can be a cylindrical cylindrical body, or it can also be a cylindrical body with other cross-sectional shapes, such as a square ring or a rectangular ring or a triangular ring or a cylindrical body with an irregular cross-section. The cylindrical body 161 and the connecting portion 162 are connected to each other. The connecting portion 162 is used to connect to the partition 10, so that the isolation ring 16 is connected to the partition 10. In other embodiments, the connecting portion 162 can also be integrally provided with the partition 10. The sealing sleeve 15 is made of a flexible material with resilience. The sealing sleeve 15 has an outer peripheral surface 153, which is in contact with the inner wall of the cylindrical body 161, and the outer peripheral surface 153 and the inner wall of the cylindrical body 161 are interference fit, so that during the movement of the push rod 6, the outer peripheral surface 153 and the inner wall of the cylindrical body 161 always remain in contact, thereby forming a seal between the push rod 6 and the partition 10, preventing foreign matter from falling into the internal space of the contactor 1 through the gap between the push rod 6 and the partition 10, affecting the normal actuation of the push rod 6.

[0057] Referring to Figures 1-8, a protruding structure is formed on the outer circumferential surface 153. The protruding structure is distributed along the entire outer circumference of the sealing sleeve and includes at least one protrusion 151. That is, when a single protrusion 151 is formed on the outer circumferential surface 153, the protrusion 151 is disposed around the entire outer circumferential surface 153. When two or more protrusions 151 are formed on the outer circumferential surface 153, each protrusion 151 may be disposed around the entire outer circumferential surface 153, or a single protrusion 151 may not be a complete circular structure, with the two or more protrusions 151 circumferentially enclosing the entire outer circumferential surface, thereby being distributed over the entire outer circumference of the sealing sleeve. In this embodiment, a single protrusion 151 is disposed around the entire outer circumferential surface 153, thereby achieving better sealing performance.

[0058] In this embodiment, when two or more protrusions 151 are formed on the outer circumferential surface 153, a recess 152 is formed between adjacent protrusions 151. The recess 152 also surrounds the entire outer circumferential surface 153, thereby forming a bellows-like structure. In this embodiment, the sealing sleeve 15 is provided with a total of three protrusions 151. The protrusions 151 create an interference fit with the inner wall of the cylindrical body 161 through their elastic force. The adjacent arrangement of the protrusions 151 and recesses 152 creates multiple seals between the sealing sleeve 15 and the isolation ring 16, improving the sealing performance between the sealing sleeve 15 and the isolation ring 16.

[0059] 4-5 , the contactor 1 in FIG4 is in a semi-energized state, and the contactor 1 in FIG5 is in an energized state; wherein, during the movement of the push rod 6, at least one protrusion 151 remains in contact with the inner wall of the cylindrical body 161, so that a sealing state is always maintained between the push rod 6 and the partition 10.

[0060] The sealing sleeve 15 is made of a flexible material with resilience. For example, the sealing sleeve 15 can be made of rubber. Because the sealing sleeve 15 is made of a flexible material with resilience, it deforms at the point of contact with the isolating ring 16, ensuring both a certain degree of sealing and relative movement between the sealing sleeve 15 and the isolating ring 16. When the push rod 6 initially moves, the flexible deformation of the protrusion 151 of the sealing sleeve 15 allows the end of the sealing sleeve away from the isolating ring to move with the push rod, while the end abutting the isolating ring remains stationary. Therefore, when the push rod 6 first moves, it does not need to overcome the interference friction between the sealing sleeve 15 and the inner wall of the cylindrical body 161. Therefore, only a small amount of thrust is required to smoothly activate the push rod 6. As the push rod 6 continues to move, the magnetic circuit system 4's core attraction force overcomes the friction of the sealing sleeve. Furthermore, during the movement of the push rod 6, the sealing sleeve 15 maintains contact with the isolating ring 16 due to its elastic force, enhancing sealing while also absorbing vibration and reducing noise. The adjacent arrangement of the convex portion 151 and the concave portion 152 on the outer circumferential surface 153 of the sealing sleeve 15 increases the flexibility of the sealing sleeve 15 at the point of contact with the isolation ring 16, thereby further enhancing the aforementioned effect and improving the sealing performance. Furthermore, due to its inherent elastic deformation, the convex portion 151 of the sealing sleeve 15 can balance the pressure difference between the first space 21 and the second space 22 through its own deformation when the push rod 6 moves, eliminating air convection between the first space 21 and the second space 22, thereby preventing metal vapor from entering the internal chamber.

[0061] 3 , a chamfered portion 1611 is formed at the open end of the cylindrical body 161 of the isolation ring 16 . Due to the provision of the chamfered portion 1611 , the assembly between the sealing sleeve 15 and the isolation ring 16 is more convenient.

[0062] The push rod 6 is fixedly connected to the sealing sleeve 15. The push rod 6 can be directly fixedly connected to the sealing sleeve 15, or, as in this embodiment, the sealing sleeve 15 is fixedly connected to the mounting seat 14, and the mounting seat 14 is fixedly connected to the push rod 6, thereby fixing the push rod 6 and the sealing sleeve 15.

[0063] The mounting base 14 can be made of plastic, for example. Therefore, as shown in Figures 9-10, the mounting base 14 can be formed and fixedly connected to the push rod 6 through a first injection molding process. Then, the sealing sleeve 15 can be formed and fixedly connected to the mounting base 14 through a second injection molding process, as shown in Figure 11.

[0064] As shown in Figures 4-5, a stepped hole 141 is provided on the mounting base 14, so that after the sealing sleeve 15 is injection-molded, a retaining structure 154 is formed on the sealing sleeve 15. The retaining structure 154 is a structure that is larger at the top and smaller at the bottom. The retaining structure 154 matches the stepped hole 141. By virtue of the retaining structure 154 of the sealing sleeve 15 and the stepped hole 141 of the mounting base 14, the sealing sleeve 15 is reliably fixed to the mounting base 14, thereby making the sealing sleeve 15 more firmly connected to the mounting base 14. The integral injection molding of the sealing sleeve 15 and the push rod 6 makes the overall structure simpler and can achieve the effect of eliminating the need for installation of the sealing sleeve 15.

[0065] As shown in Figures 3-6, in this embodiment, the sealing sleeve 15 and the mounting seat 14 are generally arranged in the axial direction of the push rod 6, and the sealing sleeve 15 is disposed below the mounting seat 14. In other embodiments, the sealing sleeve 15 can also be disposed radially around the mounting seat 14. However, in this arrangement, the isolation ring needs to be made higher, the sealing sleeve is wider than the mounting seat, the sealing sleeve is also longer overall, and the sealing assembly as a whole occupies more space and consumes more material. In this embodiment, the sealing sleeve 15 is disposed below the mounting seat 14, so that the sealing sleeve 15 can be made narrower. As a result, the projected area of ​​the sealing sleeve 15 in the radial direction of the push rod 6 is smaller, thereby reducing the air pressure resistance of the sealing sleeve 15 and the push rod 6 during movement. Therefore, when the push rod 6 moves from the initial state shown in Figure 3 to the semi-energized state shown in Figure 4 and the energized state shown in Figure 5, and then returns to the non-energized state shown in Figure 6, the magnetic circuit system 4 is more likely to drive the push rod 6 to move.

[0066] As shown in Figure 4, a relief groove 11 is provided on the upper end surface of the partition 10. The lower end of the sealing sleeve 15 can be accommodated in the relief groove 11. The relief groove 11 can make way for the sealing sleeve 15 to prevent the sealing sleeve 15 from directly contacting the partition 10 during movement (which will generate a certain amount of noise and the risk of contact rebound). The provision of the relief groove 11 can reduce the risk of contact rebound and the generation of noise. In addition, due to the provision of the relief groove 11, the relief groove 11 can make way for a portion of the sealing sleeve 15, so the overall structure of the contactor 1 is more compact and smaller in size.

[0067] 4 , the mounting seat 14 has an outer edge 142 extending radially outward, and the outer edge 142 completely covers the range of the cylindrical body 161 of the isolation ring 16 in the radial direction of the push rod 6 , so that the outer edge 142 of the mounting seat 14 has a structure similar to an "eaves", which can also prevent foreign objects from falling into the internal space of the contactor 1.

[0068] 14 , further, in other embodiments, the outer edge 142 extends downward to form a lower flange 143 , and the lower flange 143 at least partially covers the outer side of the cylindrical body 161 of the isolation ring 16 , further preventing foreign matter from falling into the internal space of the contactor 1 , while also better protecting the sealing sleeve 15 , preventing the sealing sleeve 15 from being damaged by foreign matter, and improving the sealing effect.

[0069] In other embodiments, as shown in FIG13 , the outer circumference of the sealing sleeve is provided with two or more protrusions, hereinafter referred to as a first protrusion 151′ and a second protrusion 155. The second protrusion 155 is arranged along the axial direction of the sealing sleeve 15 along with the first protrusion 151′, and the second protrusion 155 is closer to the partition 10 than the first protrusion 151′. In the axial direction, the second protrusion 155 is thicker than the first protrusion 151′. For example, the thickness of the second protrusion 155 can be 2-5 times that of the first protrusion 151′. The first protrusion 151′ can be similar to the protrusion 151 in the previous embodiment. In the embodiment shown in FIG13 , only one first protrusion 151′ and one second protrusion 155 are provided. The thicker second protrusion 155 reduces the number of protrusions on the outer circumference 153 of the sealing sleeve 15, simplifies processing, and provides better guidance for the movement of the push rod 6. Similarly, during the movement of the push rod 6, a portion of at least one second protrusion 155 remains in contact with the inner wall of the cylindrical body 161, thereby maintaining a seal between the push rod 6 and the partition 10. Alternatively, two first protrusions 151' and one second protrusion 155 can be provided. Compared to the previous arrangement of three protrusions 151, this can enhance the sealing performance while also improving the guiding performance.

[0070] In some embodiments, the first protrusions 151' and the second protrusions 155 may be alternately arranged. For example, one second protrusion 155 may be arranged between two first protrusions 151', which may also enhance the guiding and sealing properties.

[0071] Although the above embodiment is described by taking the push rod anti-jamming structure provided in the contactor as an example, the push rod anti-jamming structure has the function of preventing foreign objects from invading the protected space, and can also be used in other types of switching electrical appliances, such as relays.

[0072] Although the present disclosure has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the disclosure without departing from the spirit and scope of the disclosure as defined in the appended claims, all of which are within the scope of protection of the disclosure.

Claims

1. A push rod anti-stuck structure, characterized in that: The push rod anti-stuck structure includes an isolation ring and a sealing sleeve. The sealing sleeve is made of a flexible material with resilience. The sealing sleeve is fixedly connected to the push rod. The sealing sleeve has an outer peripheral surface. A protruding structure protruding radially outward is formed on the outer peripheral surface. The protruding structure is distributed circumferentially on the entire outer peripheral surface of the sealing sleeve. The isolation ring has a cylindrical main body, and the protruding structure is interference fit with the inner wall of the cylindrical main body by its elastic force.

2. The push rod anti-stuck structure according to claim 1, characterized in that: The protruding structure includes at least one protrusion, and each of the protrusions is arranged around the entire outer peripheral surface.

3. The push rod anti-stuck structure according to claim 2, characterized in that: The protruding structure includes two or more protrusions arranged along the axial direction of the sealing sleeve, and a recess is formed between two adjacent protrusions, so that the protruding structure forms a bellows structure, wherein the axial direction of the sealing sleeve is consistent with the length direction of the push rod.

4. The push rod anti-stuck structure according to claim 1, characterized in that: The protruding structure includes at least one first protrusion and at least one second protrusion, the thickness of the second protrusion along the axial direction of the sealing sleeve is greater than the thickness of the first protrusion along the axial direction of the sealing sleeve, and the at least one second protrusion and the at least one first protrusion are arranged along the axial direction of the sealing sleeve, wherein the axial direction of the sealing sleeve is consistent with the length direction of the push rod.

5. The push rod anti-stuck structure according to claim 1, characterized in that: The sealing sleeve is fixedly connected to a mounting seat, and the mounting seat is fixedly connected to the push rod, so that the push rod is fixedly connected to the sealing sleeve; the sealing sleeve is arranged below the mounting seat.

6. The push rod anti-stuck structure according to claim 5, characterized in that: A stepped hole is provided on the mounting seat, and a locking structure matching the stepped hole is formed on the sealing sleeve. The locking structure is a structure with a larger upper portion and a smaller lower portion. The sealing sleeve is fixedly connected to the mounting seat by means of the locking structure of the sealing sleeve and the stepped hole of the mounting seat.

7. The push rod anti-stuck structure according to claim 5, characterized in that: The mounting seat has an outer edge extending radially outward from the mounting seat, and the outer edge completely covers the range of the cylindrical body of the isolation ring in the radial direction of the push rod, wherein the radial direction of the mounting seat is perpendicular to the length direction of the push rod.

8. The push rod anti-stuck structure according to claim 7, characterized in that: The outer edge extends in an axial direction perpendicular to the radial direction of the mounting seat to form a lower flange, and the lower flange at least partially covers the outer side of the cylindrical body of the isolation ring.

9. A switch electrical appliance, characterized in that: It includes the push rod anti-stuck structure as described in any one of claims 1-8.

10. The switch device according to claim 9, characterized in that: The switching electrical appliance is a contactor, which includes a hollow shell, a magnetic circuit system and a contact system; a partition is provided in the shell, and the partition divides the space in the shell into a first space and a second space, the first space is an arc extinguishing chamber, which is used to install the contact system; the second space is an actuating chamber, which is used to install the magnetic circuit system, the push rod is movably inserted into the partition, and the contact system includes two fixed contacts and a moving contact provided on the shell, the push rod is transmission-connected to the moving contact, and the push rod anti-stuck structure is provided between the push rod and the partition.

11. The switch device according to claim 10, characterized in that: The isolation ring in the push rod anti-stuck structure is arranged on the partition, and the protruding structure includes at least one first protrusion and at least one second protrusion, wherein the second protrusion is closer to the partition than at least one first protrusion.

12. The switch device according to claim 10, characterized in that: The sealing sleeve in the push rod anti-stuck structure is fixedly connected to a mounting seat, and the mounting seat is fixedly connected to the push rod. The mounting seat is a spring seat. One side of the mounting seat is used to be installed and cooperated with one end of the contact spring in the contact system, and the other side of the mounting seat is used to install the sealing sleeve in the push rod anti-stuck structure.

13. The switch device according to claim 10, characterized in that: An avoidance groove is provided on the upper end surface of the partition, and the lower end of the sealing sleeve in the push rod anti-stuck structure can be accommodated in the avoidance groove.

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